Authorities said that the computer user who tried to cover his tracks as he downloaded sadistic and masochistic abuse was a very savvy computer user.

There were more than 600 images and videos that he downloaded, and prosecutors said they included footage of prepubescent girls being raped, whipped, threatened with knives, and held naked in a dog cage.

A video showing the rape and torture of a toddler was so terrible that a Homeland Security Investigations agent said it was one of the worst things he had ever seen in his career.

The market for child pornography has continued to grow and become more depraved.

As evidence of the threat he posed, prosecutors pointed to his past molestation of five young girls, including his four younger sisters, around 2002 when he was a teenager. Some of the abuse happened when the girls were asleep.

Roberts said that his past behavior provides an alarming window into the extent of his sexual interest in children.

In his memo, Gelfand asked the judge to sentence him to five years in prison.

He is committed to never finding himself in this situation again and he is moving forward into the next chapter.

He had to navigate unique challenges associated with being in the public spotlight since childhood, and was devoted to his faith, wife, and seven children.